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   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Juergen Stuber <juergen@jstuber.net>            *
   3  *   based on Dominic Rath's and Benedikt Sauter's usbprog.c               *
   4  *                                                                         *
   5  *   Copyright (C) 2008 by Spencer Oliver                                  *
   6  *   spen@spen-soft.co.uk                                                  *
   7  *                                                                         *
   8  *   Copyright (C) 2011 by Jean-Christophe PLAGNIOL-VIILARD                *
   9  *   plagnioj@jcrosoft.com                                                 *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <jtag/interface.h>
  32 #include <jtag/commands.h>
  33 #include "libusb_common.h"
  34
  35 /* See Segger's public documentation:
  36  * Reference manual for J-Link USB Protocol
  37  * Document RM08001-R6 Date: June 16, 2009
  38  * (Or newer, with some SWD information).
  39  * http://www.segger.com/cms/admin/uploads/productDocs/RM08001_JLinkUSBProtocol.pdf
  40  */
  41
  42 /*
  43  * The default pid of the segger is 0x0101
  44  * But when you change the USB Address it will also
  45  *
  46  * pid = ( usb_address > 0x4) ? 0x0101 : (0x101 + usb_address)
  47  */
  48
  49 #define VID 0x1366, 0x1366, 0x1366, 0x1366
  50 #define PID 0x0101, 0x0102, 0x0103, 0x0104
  51
  52 #define JLINK_WRITE_ENDPOINT    0x02
  53 #define JLINK_READ_ENDPOINT             0x81
  54
  55 static unsigned int jlink_write_ep = JLINK_WRITE_ENDPOINT;
  56 static unsigned int jlink_read_ep = JLINK_READ_ENDPOINT;
  57 static unsigned int jlink_hw_jtag_version = 2;
  58
  59 #define JLINK_USB_TIMEOUT 1000
  60
  61 /* See Section 3.3.2 of the Segger JLink USB protocol manual */
  62 /* 2048 is the max value we can use here */
  63 #define JLINK_TAP_BUFFER_SIZE 2048
  64 /*#define JLINK_TAP_BUFFER_SIZE 256*/
  65 /*#define JLINK_TAP_BUFFER_SIZE 384*/
  66
  67 #define JLINK_IN_BUFFER_SIZE                    2048
  68 #define JLINK_OUT_BUFFER_SIZE                   (2*2048 + 4)
  69 #define JLINK_EMU_RESULT_BUFFER_SIZE    64
  70
  71 /* Global USB buffers */
  72 static uint8_t usb_in_buffer[JLINK_IN_BUFFER_SIZE];
  73 static uint8_t usb_out_buffer[JLINK_OUT_BUFFER_SIZE];
  74 static uint8_t usb_emu_result_buffer[JLINK_EMU_RESULT_BUFFER_SIZE];
  75
  76 /* Constants for JLink command */
  77 #define EMU_CMD_VERSION                 0x01
  78 #define EMU_CMD_SET_SPEED               0x05
  79 #define EMU_CMD_GET_STATE               0x07
  80 #define EMU_CMD_HW_CLOCK                0xc8
  81 #define EMU_CMD_HW_TMS0                 0xc9
  82 #define EMU_CMD_HW_TMS1                 0xca
  83 #define EMU_CMD_HW_JTAG2                0xce
  84 #define EMU_CMD_HW_JTAG3                0xcf
  85 #define EMU_CMD_GET_MAX_MEM_BLOCK       0xd4
  86 #define EMU_CMD_HW_RESET0               0xdc
  87 #define EMU_CMD_HW_RESET1               0xdd
  88 #define EMU_CMD_HW_TRST0                0xde
  89 #define EMU_CMD_HW_TRST1                0xdf
  90 #define EMU_CMD_GET_CAPS                0xe8
  91 #define EMU_CMD_GET_HW_VERSION  0xf0
  92 #define EMU_CMD_READ_CONFIG             0xf2
  93 #define EMU_CMD_WRITE_CONFIG            0xf3
  94
  95 /* bits return from EMU_CMD_GET_CAPS */
  96 #define EMU_CAP_RESERVED_1              0
  97 #define EMU_CAP_GET_HW_VERSION          1
  98 #define EMU_CAP_WRITE_DCC               2
  99 #define EMU_CAP_ADAPTIVE_CLOCKING       3
 100 #define EMU_CAP_READ_CONFIG             4
 101 #define EMU_CAP_WRITE_CONFIG            5
 102 #define EMU_CAP_TRACE                   6
 103 #define EMU_CAP_WRITE_MEM               7
 104 #define EMU_CAP_READ_MEM                8
 105 #define EMU_CAP_SPEED_INFO              9
 106 #define EMU_CAP_EXEC_CODE               10
 107 #define EMU_CAP_GET_MAX_BLOCK_SIZE      11
 108 #define EMU_CAP_GET_HW_INFO             12
 109 #define EMU_CAP_SET_KS_POWER            13
 110 #define EMU_CAP_RESET_STOP_TIMED        14
 111 #define EMU_CAP_RESERVED_2              15
 112 #define EMU_CAP_MEASURE_RTCK_REACT      16
 113 #define EMU_CAP_SELECT_IF               17
 114 #define EMU_CAP_RW_MEM_ARM79            18
 115 #define EMU_CAP_GET_COUNTERS            19
 116 #define EMU_CAP_READ_DCC                20
 117 #define EMU_CAP_GET_CPU_CAPS            21
 118 #define EMU_CAP_EXEC_CPU_CMD            22
 119 #define EMU_CAP_SWO                     23
 120 #define EMU_CAP_WRITE_DCC_EX            24
 121 #define EMU_CAP_UPDATE_FIRMWARE_EX      25
 122 #define EMU_CAP_FILE_IO                 26
 123 #define EMU_CAP_REGISTER                27
 124 #define EMU_CAP_INDICATORS              28
 125 #define EMU_CAP_TEST_NET_SPEED          29
 126 #define EMU_CAP_RAWTRACE                30
 127 #define EMU_CAP_RESERVED_3              31
 128
 129 static char *jlink_cap_str[] = {
 130         "Always 1.",
 131         "Supports command EMU_CMD_GET_HARDWARE_VERSION",
 132         "Supports command EMU_CMD_WRITE_DCC",
 133         "Supports adaptive clocking",
 134         "Supports command EMU_CMD_READ_CONFIG",
 135         "Supports command EMU_CMD_WRITE_CONFIG",
 136         "Supports trace commands",
 137         "Supports command EMU_CMD_WRITE_MEM",
 138         "Supports command EMU_CMD_READ_MEM",
 139         "Supports command EMU_CMD_GET_SPEED",
 140         "Supports command EMU_CMD_CODE_...",
 141         "Supports command EMU_CMD_GET_MAX_BLOCK_SIZE",
 142         "Supports command EMU_CMD_GET_HW_INFO",
 143         "Supports command EMU_CMD_SET_KS_POWER",
 144         "Supports command EMU_CMD_HW_RELEASE_RESET_STOP_TIMED",
 145         "Reserved",
 146         "Supports command EMU_CMD_MEASURE_RTCK_REACT",
 147         "Supports command EMU_CMD_HW_SELECT_IF",
 148         "Supports command EMU_CMD_READ/WRITE_MEM_ARM79",
 149         "Supports command EMU_CMD_GET_COUNTERS",
 150         "Supports command EMU_CMD_READ_DCC",
 151         "Supports command EMU_CMD_GET_CPU_CAPS",
 152         "Supports command EMU_CMD_EXEC_CPU_CMD",
 153         "Supports command EMU_CMD_SWO",
 154         "Supports command EMU_CMD_WRITE_DCC_EX",
 155         "Supports command EMU_CMD_UPDATE_FIRMWARE_EX",
 156         "Supports command EMU_CMD_FILE_IO",
 157         "Supports command EMU_CMD_REGISTER",
 158         "Supports command EMU_CMD_INDICATORS",
 159         "Supports command EMU_CMD_TEST_NET_SPEED",
 160         "Supports command EMU_CMD_RAWTRACE",
 161         "Reserved",
 162 };
 163
 164 /* max speed 12MHz v5.0 jlink */
 165 #define JLINK_MAX_SPEED 12000
 166
 167 /* J-Link hardware versions */
 168 #define JLINK_HW_TYPE_JLINK     0
 169 #define JLINK_HW_TYPE_JTRACE    1
 170 #define JLINK_HW_TYPE_FLASHER   2
 171 #define JLINK_HW_TYPE_JLINK_PRO 3
 172 #define JLINK_HW_TYPE_MAX       4
 173
 174 static char *jlink_hw_type_str[] = {
 175         "J-Link",
 176         "J-Trace",
 177         "Flasher",
 178         "J-Link Pro",
 179 };
 180
 181 /* Queue command functions */
 182 static void jlink_end_state(tap_state_t state);
 183 static void jlink_state_move(void);
 184 static void jlink_path_move(int num_states, tap_state_t *path);
 185 static void jlink_runtest(int num_cycles);
 186 static void jlink_scan(bool ir_scan, enum scan_type type, uint8_t *buffer,
 187                 int scan_size, struct scan_command *command);
 188 static void jlink_reset(int trst, int srst);
 189 static void jlink_simple_command(uint8_t command);
 190 static int jlink_get_status(void);
 191
 192 /* J-Link tap buffer functions */
 193 static void jlink_tap_init(void);
 194 static int jlink_tap_execute(void);
 195 static void jlink_tap_ensure_space(int scans, int bits);
 196 static void jlink_tap_append_step(int tms, int tdi);
 197 static void jlink_tap_append_scan(int length, uint8_t *buffer,
 198                 struct scan_command *command);
 199
 200 /* Jlink lowlevel functions */
 201 struct jlink {
 202         struct jtag_libusb_device_handle *usb_handle;
 203 };
 204
 205 static struct jlink *jlink_usb_open(void);
 206 static void jlink_usb_close(struct jlink *jlink);
 207 static int jlink_usb_message(struct jlink *jlink, int out_length, int in_length);
 208 static int jlink_usb_write(struct jlink *jlink, int out_length);
 209 static int jlink_usb_read(struct jlink *jlink, int expected_size);
 210 static int jlink_usb_read_emu_result(struct jlink *jlink);
 211
 212 /* helper functions */
 213 static int jlink_get_version_info(void);
 214
 215 #ifdef _DEBUG_USB_COMMS_
 216 static void jlink_debug_buffer(uint8_t *buffer, int length);
 217 #else
 218 static inline void jlink_debug_buffer(uint8_t *buffer, int length)
 219 {
 220 }
 221 #endif
 222
 223 static enum tap_state jlink_last_state = TAP_RESET;
 224
 225 static struct jlink *jlink_handle;
 226
 227 /* pid could be specified at runtime */
 228 static uint16_t vids[] = { VID, 0 };
 229 static uint16_t pids[] = { PID, 0 };
 230
 231 static uint32_t jlink_caps;
 232 static uint32_t jlink_hw_type;
 233
 234 /* 256 byte non-volatile memory */
 235 struct jlink_config {
 236         uint8_t usb_address;
 237         /* 0ffset 0x01 to 0x03 */
 238         uint8_t reserved_1[3];
 239         uint32_t kickstart_power_on_jtag_pin_19;
 240         /* 0ffset 0x08 to 0x1f */
 241         uint8_t reserved_2[24];
 242         /* IP only for J-Link Pro */
 243         uint8_t ip_address[4];
 244         uint8_t subnet_mask[4];
 245         /* 0ffset 0x28 to 0x2f */
 246         uint8_t reserved_3[8];
 247         uint8_t mac_address[6];
 248         /* 0ffset 0x36 to 0xff */
 249         uint8_t reserved_4[202];
 250 } __attribute__ ((packed));
 251 struct jlink_config jlink_cfg;
 252
 253 /***************************************************************************/
 254 /* External interface implementation */
 255
 256 static void jlink_execute_runtest(struct jtag_command *cmd)
 257 {
 258         DEBUG_JTAG_IO("runtest %i cycles, end in %i",
 259                         cmd->cmd.runtest->num_cycles,
 260                         cmd->cmd.runtest->end_state);
 261
 262         jlink_end_state(cmd->cmd.runtest->end_state);
 263
 264         jlink_runtest(cmd->cmd.runtest->num_cycles);
 265 }
 266
 267 static void jlink_execute_statemove(struct jtag_command *cmd)
 268 {
 269         DEBUG_JTAG_IO("statemove end in %i", cmd->cmd.statemove->end_state);
 270
 271         jlink_end_state(cmd->cmd.statemove->end_state);
 272         jlink_state_move();
 273 }
 274
 275 static void jlink_execute_pathmove(struct jtag_command *cmd)
 276 {
 277         DEBUG_JTAG_IO("pathmove: %i states, end in %i",
 278                 cmd->cmd.pathmove->num_states,
 279                 cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
 280
 281         jlink_path_move(cmd->cmd.pathmove->num_states,
 282                         cmd->cmd.pathmove->path);
 283 }
 284
 285 static void jlink_execute_scan(struct jtag_command *cmd)
 286 {
 287         int scan_size;
 288         enum scan_type type;
 289         uint8_t *buffer;
 290
 291         DEBUG_JTAG_IO("scan end in %s", tap_state_name(cmd->cmd.scan->end_state));
 292
 293         jlink_end_state(cmd->cmd.scan->end_state);
 294
 295         scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
 296         DEBUG_JTAG_IO("scan input, length = %d", scan_size);
 297
 298         jlink_debug_buffer(buffer, (scan_size + 7) / 8);
 299         type = jtag_scan_type(cmd->cmd.scan);
 300         jlink_scan(cmd->cmd.scan->ir_scan,
 301                         type, buffer, scan_size, cmd->cmd.scan);
 302 }
 303
 304 static void jlink_execute_reset(struct jtag_command *cmd)
 305 {
 306         DEBUG_JTAG_IO("reset trst: %i srst %i",
 307                         cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 308
 309         jlink_tap_execute();
 310         jlink_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
 311         jlink_tap_execute();
 312 }
 313
 314 static void jlink_execute_sleep(struct jtag_command *cmd)
 315 {
 316         DEBUG_JTAG_IO("sleep %" PRIi32 "", cmd->cmd.sleep->us);
 317         jlink_tap_execute();
 318         jtag_sleep(cmd->cmd.sleep->us);
 319 }
 320
 321 static void jlink_execute_command(struct jtag_command *cmd)
 322 {
 323         switch (cmd->type) {
 324                 case JTAG_RUNTEST:
 325                         jlink_execute_runtest(cmd);
 326                         break;
 327                 case JTAG_TLR_RESET:
 328                         jlink_execute_statemove(cmd);
 329                         break;
 330                 case JTAG_PATHMOVE:
 331                         jlink_execute_pathmove(cmd);
 332                         break;
 333                 case JTAG_SCAN:
 334                         jlink_execute_scan(cmd);
 335                         break;
 336                 case JTAG_RESET:
 337                         jlink_execute_reset(cmd);
 338                         break;
 339                 case JTAG_SLEEP:
 340                         jlink_execute_sleep(cmd);
 341                         break;
 342                 default:
 343                         LOG_ERROR("BUG: unknown JTAG command type encountered");
 344                         exit(-1);
 345         }
 346 }
 347
 348 static int jlink_execute_queue(void)
 349 {
 350         struct jtag_command *cmd = jtag_command_queue;
 351
 352         while (cmd != NULL) {
 353                 jlink_execute_command(cmd);
 354                 cmd = cmd->next;
 355         }
 356
 357         return jlink_tap_execute();
 358 }
 359
 360 /* Sets speed in kHz. */
 361 static int jlink_speed(int speed)
 362 {
 363         int result;
 364
 365         if (speed > JLINK_MAX_SPEED) {
 366                 LOG_INFO("reduce speed request: %dkHz to %dkHz maximum",
 367                                 speed, JLINK_MAX_SPEED);
 368                 speed = JLINK_MAX_SPEED;
 369         }
 370
 371         /* check for RTCK setting */
 372         if (speed == 0)
 373                 speed = -1;
 374
 375         usb_out_buffer[0] = EMU_CMD_SET_SPEED;
 376         usb_out_buffer[1] = (speed >> 0) & 0xff;
 377         usb_out_buffer[2] = (speed >> 8) & 0xff;
 378
 379         result = jlink_usb_write(jlink_handle, 3);
 380         if (result != 3) {
 381                 LOG_ERROR("J-Link setting speed failed (%d)", result);
 382                 return ERROR_JTAG_DEVICE_ERROR;
 383         }
 384
 385         return ERROR_OK;
 386 }
 387
 388 static int jlink_speed_div(int speed, int *khz)
 389 {
 390         *khz = speed;
 391
 392         return ERROR_OK;
 393 }
 394
 395 static int jlink_khz(int khz, int *jtag_speed)
 396 {
 397         *jtag_speed = khz;
 398
 399         return ERROR_OK;
 400 }
 401
 402 static int jlink_init(void)
 403 {
 404         int i;
 405
 406         jlink_handle = jlink_usb_open();
 407
 408         if (jlink_handle == 0) {
 409                 LOG_ERROR("Cannot find jlink Interface! Please check "
 410                                 "connection and permissions.");
 411                 return ERROR_JTAG_INIT_FAILED;
 412         }
 413
 414         /*
 415          * The next three instructions were added after discovering a problem
 416          * while using an oscilloscope.
 417          * For the V8 SAM-ICE dongle (and likely other j-link device variants),
 418          * the reset line to the target microprocessor was found to cycle only
 419          * intermittently during emulator startup (even after encountering the
 420          * downstream reset instruction later in the code).
 421          * This was found to create two issues:
 422          * 1) In general it is a bad practice to not reset a CPU to a known
 423          * state when starting an emulator and
 424          * 2) something critical happens inside the dongle when it does the
 425          * first read following a new USB session.
 426          * Keeping the processor in reset during the first read collecting
 427          * version information seems to prevent errant
 428          * "J-Link command EMU_CMD_VERSION failed" issues.
 429          */
 430
 431         LOG_INFO("J-Link initialization started / target CPU reset initiated");
 432         jlink_simple_command(EMU_CMD_HW_TRST0);
 433         jlink_simple_command(EMU_CMD_HW_RESET0);
 434         usleep(1000);
 435
 436         jlink_hw_jtag_version = 2;
 437
 438         if (jlink_get_version_info() == ERROR_OK) {
 439                 /* attempt to get status */
 440                 jlink_get_status();
 441         }
 442
 443         LOG_INFO("J-Link JTAG Interface ready");
 444
 445         jlink_reset(0, 0);
 446         jtag_sleep(3000);
 447         jlink_tap_init();
 448
 449         /* v5/6 jlink seems to have an issue if the first tap move
 450          * is not divisible by 8, so we send a TLR on first power up */
 451         for (i = 0; i < 8; i++)
 452                 jlink_tap_append_step(1, 0);
 453         jlink_tap_execute();
 454
 455         return ERROR_OK;
 456 }
 457
 458 static int jlink_quit(void)
 459 {
 460         jlink_usb_close(jlink_handle);
 461         return ERROR_OK;
 462 }
 463
 464 /***************************************************************************/
 465 /* Queue command implementations */
 466
 467 static void jlink_end_state(tap_state_t state)
 468 {
 469         if (tap_is_state_stable(state))
 470                 tap_set_end_state(state);
 471         else {
 472                 LOG_ERROR("BUG: %i is not a valid end state", state);
 473                 exit(-1);
 474         }
 475 }
 476
 477 /* Goes to the end state. */
 478 static void jlink_state_move(void)
 479 {
 480         int i;
 481         int tms = 0;
 482         uint8_t tms_scan = tap_get_tms_path(tap_get_state(), tap_get_end_state());
 483         uint8_t tms_scan_bits = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
 484
 485         for (i = 0; i < tms_scan_bits; i++) {
 486                 tms = (tms_scan >> i) & 1;
 487                 jlink_tap_append_step(tms, 0);
 488         }
 489
 490         tap_set_state(tap_get_end_state());
 491 }
 492
 493 static void jlink_path_move(int num_states, tap_state_t *path)
 494 {
 495         int i;
 496
 497         for (i = 0; i < num_states; i++) {
 498                 if (path[i] == tap_state_transition(tap_get_state(), false))
 499                         jlink_tap_append_step(0, 0);
 500                 else if (path[i] == tap_state_transition(tap_get_state(), true))
 501                         jlink_tap_append_step(1, 0);
 502                 else {
 503                         LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition",
 504                                         tap_state_name(tap_get_state()), tap_state_name(path[i]));
 505                         exit(-1);
 506                 }
 507
 508                 tap_set_state(path[i]);
 509         }
 510
 511         tap_set_end_state(tap_get_state());
 512 }
 513
 514 static void jlink_runtest(int num_cycles)
 515 {
 516         int i;
 517
 518         tap_state_t saved_end_state = tap_get_end_state();
 519
 520         jlink_tap_ensure_space(1, num_cycles + 16);
 521
 522         /* only do a state_move when we're not already in IDLE */
 523         if (tap_get_state() != TAP_IDLE) {
 524                 jlink_end_state(TAP_IDLE);
 525                 jlink_state_move();
 526                 /* num_cycles--; */
 527         }
 528
 529         /* execute num_cycles */
 530         for (i = 0; i < num_cycles; i++)
 531                 jlink_tap_append_step(0, 0);
 532
 533         /* finish in end_state */
 534         jlink_end_state(saved_end_state);
 535         if (tap_get_state() != tap_get_end_state())
 536                 jlink_state_move();
 537 }
 538
 539 static void jlink_scan(bool ir_scan, enum scan_type type, uint8_t *buffer,
 540                 int scan_size, struct scan_command *command)
 541 {
 542         tap_state_t saved_end_state;
 543
 544         jlink_tap_ensure_space(1, scan_size + 16);
 545
 546         saved_end_state = tap_get_end_state();
 547
 548         /* Move to appropriate scan state */
 549         jlink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
 550
 551         /* Only move if we're not already there */
 552         if (tap_get_state() != tap_get_end_state())
 553                 jlink_state_move();
 554
 555         jlink_end_state(saved_end_state);
 556
 557         /* Scan */
 558         jlink_tap_append_scan(scan_size, buffer, command);
 559
 560         /* We are in Exit1, go to Pause */
 561         jlink_tap_append_step(0, 0);
 562
 563         tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
 564
 565         if (tap_get_state() != tap_get_end_state())
 566                 jlink_state_move();
 567 }
 568
 569 static void jlink_reset(int trst, int srst)
 570 {
 571         LOG_DEBUG("trst: %i, srst: %i", trst, srst);
 572
 573         /* Signals are active low */
 574         if (srst == 0)
 575                 jlink_simple_command(EMU_CMD_HW_RESET1);
 576
 577         if (srst == 1)
 578                 jlink_simple_command(EMU_CMD_HW_RESET0);
 579
 580         if (trst == 1)
 581                 jlink_simple_command(EMU_CMD_HW_TRST0);
 582
 583         if (trst == 0)
 584                 jlink_simple_command(EMU_CMD_HW_TRST1);
 585 }
 586
 587 static void jlink_simple_command(uint8_t command)
 588 {
 589         int result;
 590
 591         DEBUG_JTAG_IO("0x%02x", command);
 592
 593         usb_out_buffer[0] = command;
 594         result = jlink_usb_write(jlink_handle, 1);
 595
 596         if (result != 1)
 597                 LOG_ERROR("J-Link command 0x%02x failed (%d)", command, result);
 598 }
 599
 600 static int jlink_get_status(void)
 601 {
 602         int result;
 603
 604         jlink_simple_command(EMU_CMD_GET_STATE);
 605
 606         result = jlink_usb_read(jlink_handle, 8);
 607         if (result != 8) {
 608                 LOG_ERROR("J-Link command EMU_CMD_GET_STATE failed (%d)", result);
 609                 return ERROR_JTAG_DEVICE_ERROR;
 610         }
 611
 612         int vref = usb_in_buffer[0] + (usb_in_buffer[1] << 8);
 613         LOG_INFO("Vref = %d.%d TCK = %d TDI = %d TDO = %d TMS = %d SRST = %d TRST = %d", \
 614                 vref / 1000, vref % 1000, \
 615                 usb_in_buffer[2], usb_in_buffer[3], usb_in_buffer[4], \
 616                 usb_in_buffer[5], usb_in_buffer[6], usb_in_buffer[7]);
 617
 618         if (vref < 1500)
 619                 LOG_ERROR("Vref too low. Check Target Power");
 620
 621         return ERROR_OK;
 622 }
 623
 624 #define jlink_dump_printf(context, expr ...) \
 625         do { \
 626                 if (context) \
 627                         command_print(context, expr); \
 628                         else \
 629                         LOG_INFO(expr); \
 630         } while (0);
 631
 632 static void jlink_caps_dump(struct command_context *ctx)
 633 {
 634         int i;
 635
 636         jlink_dump_printf(ctx, "J-Link Capabilities");
 637
 638         for (i = 1; i < 31; i++)
 639                 if (jlink_caps & (1 << i))
 640                         jlink_dump_printf(ctx, "%s", jlink_cap_str[i]);
 641 }
 642
 643 static void jlink_config_usb_address_dump(struct command_context *ctx, struct jlink_config *cfg)
 644 {
 645         if (!cfg)
 646                 return;
 647
 648         jlink_dump_printf(ctx, "USB-Address: 0x%x", cfg->usb_address);
 649 }
 650
 651 static void jlink_config_kickstart_dump(struct command_context *ctx, struct jlink_config *cfg)
 652 {
 653         if (!cfg)
 654                 return;
 655
 656         jlink_dump_printf(ctx, "Kickstart power on JTAG-pin 19: 0x%x",
 657                 cfg->kickstart_power_on_jtag_pin_19);
 658 }
 659
 660 static void jlink_config_mac_address_dump(struct command_context *ctx, struct jlink_config *cfg)
 661 {
 662         if (!cfg)
 663                 return;
 664
 665         jlink_dump_printf(ctx, "MAC Address: %.02x:%.02x:%.02x:%.02x:%.02x:%.02x",
 666                 cfg->mac_address[5], cfg->mac_address[4],
 667                 cfg->mac_address[3], cfg->mac_address[2],
 668                 cfg->mac_address[1], cfg->mac_address[0]);
 669 }
 670
 671 static void jlink_config_ip_dump(struct command_context *ctx, struct jlink_config *cfg)
 672 {
 673         if (!cfg)
 674                 return;
 675
 676         jlink_dump_printf(ctx, "IP Address: %d.%d.%d.%d",
 677                 cfg->ip_address[3], cfg->ip_address[2],
 678                 cfg->ip_address[1], cfg->ip_address[0]);
 679         jlink_dump_printf(ctx, "Subnet Mask: %d.%d.%d.%d",
 680                 cfg->subnet_mask[3], cfg->subnet_mask[2],
 681                 cfg->subnet_mask[1], cfg->subnet_mask[0]);
 682 }
 683
 684 static void jlink_config_dump(struct command_context *ctx, struct jlink_config *cfg)
 685 {
 686         if (!cfg)
 687                 return;
 688
 689         jlink_dump_printf(ctx, "J-Link configuration");
 690         jlink_config_usb_address_dump(ctx, cfg);
 691         jlink_config_kickstart_dump(ctx, cfg);
 692
 693         if (jlink_hw_type == JLINK_HW_TYPE_JLINK_PRO) {
 694                 jlink_config_ip_dump(ctx, cfg);
 695                 jlink_config_mac_address_dump(ctx, cfg);
 696         }
 697 }
 698
 699 static int jlink_get_config(struct jlink_config *cfg)
 700 {
 701         int result;
 702         int size = sizeof(struct jlink_config);
 703
 704         jlink_simple_command(EMU_CMD_READ_CONFIG);
 705
 706         result = jlink_usb_read(jlink_handle, size);
 707         if (size != result) {
 708                 LOG_ERROR("jlink_usb_read failed (requested=%d, result=%d)", size, result);
 709                 return ERROR_FAIL;
 710         }
 711
 712         memcpy(cfg, usb_in_buffer, size);
 713
 714         /*
 715          * Section 4.2.4 IN-transaction
 716          * read dummy 0-byte packet
 717          */
 718         jlink_usb_read(jlink_handle, 1);
 719
 720         return ERROR_OK;
 721 }
 722
 723 static int jlink_set_config(struct jlink_config *cfg)
 724 {
 725         int result;
 726         int size = sizeof(struct jlink_config);
 727
 728         jlink_simple_command(EMU_CMD_WRITE_CONFIG);
 729
 730         memcpy(usb_out_buffer, cfg, size);
 731
 732         result = jlink_usb_write(jlink_handle, size);
 733         if (result != size) {
 734                 LOG_ERROR("jlink_usb_write failed (requested=%d, result=%d)", 256, result);
 735                 return ERROR_FAIL;
 736         }
 737
 738         return ERROR_OK;
 739 }
 740
 741 static int jlink_get_version_info(void)
 742 {
 743         int result;
 744         int len;
 745         uint32_t jlink_max_size;
 746
 747         /* query hardware version */
 748         jlink_simple_command(EMU_CMD_VERSION);
 749
 750         result = jlink_usb_read(jlink_handle, 2);
 751         if (2 != result) {
 752                 LOG_ERROR("J-Link command EMU_CMD_VERSION failed (%d)", result);
 753                 return ERROR_JTAG_DEVICE_ERROR;
 754         }
 755
 756         len = buf_get_u32(usb_in_buffer, 0, 16);
 757         if (len > JLINK_IN_BUFFER_SIZE) {
 758                 LOG_ERROR("J-Link command EMU_CMD_VERSION impossible return length 0x%0x", len);
 759                 len = JLINK_IN_BUFFER_SIZE;
 760         }
 761
 762         result = jlink_usb_read(jlink_handle, len);
 763         if (result != len) {
 764                 LOG_ERROR("J-Link command EMU_CMD_VERSION failed (%d)", result);
 765                 return ERROR_JTAG_DEVICE_ERROR;
 766         }
 767
 768         usb_in_buffer[result] = 0;
 769         LOG_INFO("%s", (char *)usb_in_buffer);
 770
 771         /* query hardware capabilities */
 772         jlink_simple_command(EMU_CMD_GET_CAPS);
 773
 774         result = jlink_usb_read(jlink_handle, 4);
 775         if (4 != result) {
 776                 LOG_ERROR("J-Link command EMU_CMD_GET_CAPS failed (%d)", result);
 777                 return ERROR_JTAG_DEVICE_ERROR;
 778         }
 779
 780         jlink_caps = buf_get_u32(usb_in_buffer, 0, 32);
 781         LOG_INFO("J-Link caps 0x%x", (unsigned)jlink_caps);
 782
 783         if (jlink_caps & (1 << EMU_CAP_GET_HW_VERSION)) {
 784                 /* query hardware version */
 785                 jlink_simple_command(EMU_CMD_GET_HW_VERSION);
 786
 787                 result = jlink_usb_read(jlink_handle, 4);
 788                 if (4 != result) {
 789                         LOG_ERROR("J-Link command EMU_CMD_GET_HW_VERSION failed (%d)", result);
 790                         return ERROR_JTAG_DEVICE_ERROR;
 791                 }
 792
 793                 uint32_t jlink_hw_version = buf_get_u32(usb_in_buffer, 0, 32);
 794                 uint32_t major_revision = (jlink_hw_version / 10000) % 100;
 795                 jlink_hw_type = (jlink_hw_version / 1000000) % 100;
 796                 if (major_revision >= 5)
 797                         jlink_hw_jtag_version = 3;
 798
 799                 LOG_INFO("J-Link hw version %i", (int)jlink_hw_version);
 800
 801                 if (jlink_hw_type >= JLINK_HW_TYPE_MAX)
 802                         LOG_INFO("J-Link hw type uknown 0x%x", jlink_hw_type);
 803                 else
 804                         LOG_INFO("J-Link hw type %s", jlink_hw_type_str[jlink_hw_type]);
 805         }
 806
 807         if (jlink_caps & (1 << EMU_CAP_GET_MAX_BLOCK_SIZE)) {
 808                 /* query hardware maximum memory block */
 809                 jlink_simple_command(EMU_CMD_GET_MAX_MEM_BLOCK);
 810
 811                 result = jlink_usb_read(jlink_handle, 4);
 812                 if (4 != result) {
 813                         LOG_ERROR("J-Link command EMU_CMD_GET_MAX_MEM_BLOCK failed (%d)", result);
 814                         return ERROR_JTAG_DEVICE_ERROR;
 815                 }
 816
 817                 jlink_max_size = buf_get_u32(usb_in_buffer, 0, 32);
 818                 LOG_INFO("J-Link max mem block %i", (int)jlink_max_size);
 819         }
 820
 821         if (jlink_caps & (1 << EMU_CAP_READ_CONFIG)) {
 822                 if (jlink_get_config(&jlink_cfg) != ERROR_OK)
 823                         return ERROR_JTAG_DEVICE_ERROR;
 824
 825                 jlink_config_dump(NULL, &jlink_cfg);
 826         }
 827
 828         return ERROR_OK;
 829 }
 830
 831 COMMAND_HANDLER(jlink_pid_command)
 832 {
 833         if (CMD_ARGC != 1) {
 834                 LOG_ERROR("Need exactly one argument to jlink_pid");
 835                 return ERROR_FAIL;
 836         }
 837
 838         pids[0] = strtoul(CMD_ARGV[0], NULL, 16);
 839         pids[1] = 0;
 840         vids[1] = 0;
 841
 842         return ERROR_OK;
 843 }
 844
 845 COMMAND_HANDLER(jlink_handle_jlink_info_command)
 846 {
 847         if (jlink_get_version_info() == ERROR_OK) {
 848                 /* attempt to get status */
 849                 jlink_get_status();
 850         }
 851
 852         return ERROR_OK;
 853 }
 854
 855 COMMAND_HANDLER(jlink_handle_jlink_caps_command)
 856 {
 857         jlink_caps_dump(CMD_CTX);
 858
 859         return ERROR_OK;
 860 }
 861
 862 COMMAND_HANDLER(jlink_handle_jlink_hw_jtag_command)
 863 {
 864         switch (CMD_ARGC) {
 865                 case 0:
 866                         command_print(CMD_CTX, "J-Link hw jtag  %i", jlink_hw_jtag_version);
 867                         break;
 868                 case 1: {
 869                         int request_version = atoi(CMD_ARGV[0]);
 870                         switch (request_version) {
 871                                 case 2:
 872                                 case 3:
 873                                         jlink_hw_jtag_version = request_version;
 874                                         break;
 875                                 default:
 876                                         return ERROR_COMMAND_SYNTAX_ERROR;
 877                         }
 878                         break;
 879                 }
 880                 default:
 881                         return ERROR_COMMAND_SYNTAX_ERROR;
 882         }
 883
 884         return ERROR_OK;
 885 }
 886
 887 COMMAND_HANDLER(jlink_handle_jlink_kickstart_command)
 888 {
 889         uint32_t kickstart;
 890
 891         if (CMD_ARGC < 1) {
 892                 jlink_config_kickstart_dump(CMD_CTX, &jlink_cfg);
 893                 return ERROR_OK;
 894         }
 895
 896         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], kickstart);
 897
 898         jlink_cfg.kickstart_power_on_jtag_pin_19 = kickstart;
 899         return ERROR_OK;
 900 }
 901
 902 COMMAND_HANDLER(jlink_handle_jlink_mac_address_command)
 903 {
 904         uint8_t addr[6];
 905         int i;
 906         char *e;
 907         const char *str;
 908
 909         if (CMD_ARGC < 1) {
 910                 jlink_config_mac_address_dump(CMD_CTX, &jlink_cfg);
 911                 return ERROR_OK;
 912         }
 913
 914         str = CMD_ARGV[0];
 915
 916         if ((strlen(str) != 17) || (str[2] != ':' || str[5] != ':' || str[8] != ':' ||
 917                 str[11] != ':' || str[14] != ':')) {
 918                 command_print(CMD_CTX, "ethaddr miss format ff:ff:ff:ff:ff:ff");
 919                 return ERROR_COMMAND_SYNTAX_ERROR;
 920         }
 921
 922         for (i = 5; i >= 0; i--) {
 923                 addr[i] = strtoul(str, &e, 16);
 924                 str = e + 1;
 925         }
 926
 927         if (!(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5])) {
 928                 command_print(CMD_CTX, "invalid it's zero mac_address");
 929                 return ERROR_COMMAND_SYNTAX_ERROR;
 930         }
 931
 932         if (!(0x01 & addr[0])) {
 933                 command_print(CMD_CTX, "invalid it's a multicat mac_address");
 934                 return ERROR_COMMAND_SYNTAX_ERROR;
 935         }
 936
 937         memcpy(jlink_cfg.mac_address, addr, sizeof(addr));
 938
 939         return ERROR_OK;
 940 }
 941
 942 static int string_to_ip(const char *s, uint8_t *ip, int *pos)
 943 {
 944         uint8_t lip[4];
 945         char *e;
 946         const char *s_save = s;
 947         int i;
 948
 949         if (!s)
 950                 return -EINVAL;
 951
 952         for (i = 0; i < 4; i++) {
 953                 lip[i] = strtoul(s, &e, 10);
 954
 955                 if (*e != '.' && i != 3)
 956                         return -EINVAL;
 957
 958                 s = e + 1;
 959         }
 960
 961         *pos = e - s_save;
 962
 963         memcpy(ip, lip, sizeof(lip));
 964         return ERROR_OK;
 965 }
 966
 967 static void cpy_ip(uint8_t *dst, uint8_t *src)
 968 {
 969         int i, j;
 970
 971         for (i = 0, j = 3; i < 4; i++, j--)
 972                 dst[i] = src[j];
 973 }
 974
 975 COMMAND_HANDLER(jlink_handle_jlink_ip_command)
 976 {
 977         uint32_t ip_address;
 978         uint32_t subnet_mask = 0;
 979         int i, len;
 980         int ret;
 981         uint8_t subnet_bits = 24;
 982
 983         if (CMD_ARGC < 1) {
 984                 jlink_config_ip_dump(CMD_CTX, &jlink_cfg);
 985                 return ERROR_OK;
 986         }
 987
 988         ret = string_to_ip(CMD_ARGV[0], (uint8_t *)&ip_address, &i);
 989         if (ret != ERROR_OK)
 990                 return ret;
 991
 992         len = strlen(CMD_ARGV[0]);
 993
 994         /* check for this format A.B.C.D/E */
 995
 996         if (i < len) {
 997                 if (CMD_ARGV[0][i] != '/')
 998                         return ERROR_COMMAND_SYNTAX_ERROR;
 999
1000                 COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0] + i + 1, subnet_bits);
1001         } else {
1002                 if (CMD_ARGC > 1) {
1003                         ret = string_to_ip(CMD_ARGV[1], (uint8_t *)&subnet_mask, &i);
1004                         if (ret != ERROR_OK)
1005                                 return ret;
1006                 }
1007         }
1008
1009         if (!subnet_mask)
1010                 subnet_mask = (uint32_t)(subnet_bits < 32 ?
1011                                 ((1ULL << subnet_bits) - 1) : 0xffffffff);
1012
1013         cpy_ip(jlink_cfg.ip_address, (uint8_t *)&ip_address);
1014         cpy_ip(jlink_cfg.subnet_mask, (uint8_t *)&subnet_mask);
1015
1016         return ERROR_OK;
1017 }
1018
1019 COMMAND_HANDLER(jlink_handle_jlink_reset_command)
1020 {
1021         memset(&jlink_cfg, 0xff, sizeof(jlink_cfg));
1022         return ERROR_OK;
1023 }
1024
1025 COMMAND_HANDLER(jlink_handle_jlink_save_command)
1026 {
1027         if (!(jlink_caps & (1 << EMU_CAP_WRITE_CONFIG))) {
1028                 command_print(CMD_CTX, "J-Link write emulator configuration not supported");
1029                 return ERROR_OK;
1030         }
1031
1032         command_print(CMD_CTX, "The J-Link need to be unpluged and repluged ta have the config effective");
1033         return jlink_set_config(&jlink_cfg);
1034 }
1035
1036 COMMAND_HANDLER(jlink_handle_jlink_usb_address_command)
1037 {
1038         uint32_t address;
1039
1040         if (CMD_ARGC < 1) {
1041                 jlink_config_usb_address_dump(CMD_CTX, &jlink_cfg);
1042                 return ERROR_OK;
1043         }
1044
1045         COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], address);
1046
1047         if (address > 0x3 && address != 0xff) {
1048                 command_print(CMD_CTX, "USB Address must be between 0x00 and 0x03 or 0xff");
1049                 return ERROR_COMMAND_SYNTAX_ERROR;
1050         }
1051
1052         jlink_cfg.usb_address = address;
1053         return ERROR_OK;
1054 }
1055
1056 COMMAND_HANDLER(jlink_handle_jlink_config_command)
1057 {
1058         struct jlink_config cfg;
1059         int ret = ERROR_OK;
1060
1061         if (CMD_ARGC == 0) {
1062                 if (!(jlink_caps & (1 << EMU_CAP_READ_CONFIG))) {
1063                         command_print(CMD_CTX, "J-Link read emulator configuration not supported");
1064                         goto exit;
1065                 }
1066
1067                 ret = jlink_get_config(&cfg);
1068
1069                 if (ret != ERROR_OK)
1070                         command_print(CMD_CTX, "J-Link read emulator configuration failled");
1071                 else
1072                         jlink_config_dump(CMD_CTX, &jlink_cfg);
1073         }
1074
1075 exit:
1076         return ret;
1077 }
1078
1079 static const struct command_registration jlink_config_subcommand_handlers[] = {
1080         {
1081                 .name = "kickstart",
1082                 .handler = &jlink_handle_jlink_kickstart_command,
1083                 .mode = COMMAND_EXEC,
1084                 .help = "set Kickstart power on JTAG-pin 19.",
1085                 .usage = "[val]",
1086         },
1087         {
1088                 .name = "mac_address",
1089                 .handler = &jlink_handle_jlink_mac_address_command,
1090                 .mode = COMMAND_EXEC,
1091                 .help = "set the MAC Address",
1092                 .usage = "[ff:ff:ff:ff:ff:ff]",
1093         },
1094         {
1095                 .name = "ip",
1096                 .handler = &jlink_handle_jlink_ip_command,
1097                 .mode = COMMAND_EXEC,
1098                 .help = "set the ip address of the J-Link Pro, "
1099                         "where A.B.C.D is the ip, "
1100                         "E the bit of the subnet mask, "
1101                         "F.G.H.I the subnet mask",
1102                 .usage = "[A.B.C.D[/E] [F.G.H.I]]",
1103         },
1104         {
1105                 .name = "reset",
1106                 .handler = &jlink_handle_jlink_reset_command,
1107                 .mode = COMMAND_EXEC,
1108                 .help = "reset the current config",
1109         },
1110         {
1111                 .name = "save",
1112                 .handler = &jlink_handle_jlink_save_command,
1113                 .mode = COMMAND_EXEC,
1114                 .help = "save the current config",
1115         },
1116         {
1117                 .name = "usb_address",
1118                 .handler = &jlink_handle_jlink_usb_address_command,
1119                 .mode = COMMAND_EXEC,
1120                 .help = "set the USB-Address, "
1121                         "This will change the product id",
1122                 .usage = "[0x00 to 0x03 or 0xff]",
1123         },
1124         COMMAND_REGISTRATION_DONE
1125 };
1126
1127 static const struct command_registration jlink_subcommand_handlers[] = {
1128         {
1129                 .name = "caps",
1130                 .handler = &jlink_handle_jlink_caps_command,
1131                 .mode = COMMAND_EXEC,
1132                 .help = "show jlink capabilities",
1133         },
1134         {
1135                 .name = "info",
1136                 .handler = &jlink_handle_jlink_info_command,
1137                 .mode = COMMAND_EXEC,
1138                 .help = "show jlink info",
1139         },
1140         {
1141                 .name = "hw_jtag",
1142                 .handler = &jlink_handle_jlink_hw_jtag_command,
1143                 .mode = COMMAND_EXEC,
1144                 .help = "access J-Link HW JTAG command version",
1145                 .usage = "[2|3]",
1146         },
1147         {
1148                 .name = "config",
1149                 .handler = &jlink_handle_jlink_config_command,
1150                 .mode = COMMAND_EXEC,
1151                 .help = "access J-Link configuration, "
1152                         "if no argument this will dump the config",
1153                 .chain = jlink_config_subcommand_handlers,
1154         },
1155         {
1156                 .name = "pid",
1157                 .handler = &jlink_pid_command,
1158                 .mode = COMMAND_CONFIG,
1159                 .help = "set the pid of the interface we want to use",
1160         },
1161         COMMAND_REGISTRATION_DONE
1162 };
1163
1164 static const struct command_registration jlink_command_handlers[] = {
1165         {
1166                 .name = "jlink",
1167                 .mode = COMMAND_ANY,
1168                 .help = "perform jlink management",
1169                 .chain = jlink_subcommand_handlers,
1170         },
1171         COMMAND_REGISTRATION_DONE
1172 };
1173
1174 struct jtag_interface jlink_interface = {
1175         .name = "jlink",
1176         .commands = jlink_command_handlers,
1177
1178         .execute_queue = jlink_execute_queue,
1179         .speed = jlink_speed,
1180         .speed_div = jlink_speed_div,
1181         .khz = jlink_khz,
1182         .init = jlink_init,
1183         .quit = jlink_quit,
1184 };
1185
1186 /***************************************************************************/
1187 /* J-Link tap functions */
1188
1189
1190 static unsigned tap_length;
1191 static uint8_t tms_buffer[JLINK_TAP_BUFFER_SIZE];
1192 static uint8_t tdi_buffer[JLINK_TAP_BUFFER_SIZE];
1193 static uint8_t tdo_buffer[JLINK_TAP_BUFFER_SIZE];
1194
1195 struct pending_scan_result {
1196         int first;      /* First bit position in tdo_buffer to read */
1197         int length; /* Number of bits to read */
1198         struct scan_command *command; /* Corresponding scan command */
1199         uint8_t *buffer;
1200 };
1201
1202 #define MAX_PENDING_SCAN_RESULTS 256
1203
1204 static int pending_scan_results_length;
1205 static struct pending_scan_result pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
1206
1207 static void jlink_tap_init(void)
1208 {
1209         tap_length = 0;
1210         pending_scan_results_length = 0;
1211 }
1212
1213 static void jlink_tap_ensure_space(int scans, int bits)
1214 {
1215         int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
1216         int available_bits = JLINK_TAP_BUFFER_SIZE * 8 - tap_length - 32;
1217
1218         if (scans > available_scans || bits > available_bits)
1219                 jlink_tap_execute();
1220 }
1221
1222 static void jlink_tap_append_step(int tms, int tdi)
1223 {
1224         int index_var = tap_length / 8;
1225
1226         if (index_var >= JLINK_TAP_BUFFER_SIZE) {
1227                 LOG_ERROR("jlink_tap_append_step: overflow");
1228                 *(uint32_t *)0xFFFFFFFF = 0;
1229                 exit(-1);
1230         }
1231
1232         int bit_index = tap_length % 8;
1233         uint8_t bit = 1 << bit_index;
1234
1235         /* we do not pad TMS, so be sure to initialize all bits */
1236         if (0 == bit_index)
1237                 tms_buffer[index_var] = tdi_buffer[index_var] = 0;
1238
1239         if (tms)
1240                 tms_buffer[index_var] |= bit;
1241         else
1242                 tms_buffer[index_var] &= ~bit;
1243
1244         if (tdi)
1245                 tdi_buffer[index_var] |= bit;
1246         else
1247                 tdi_buffer[index_var] &= ~bit;
1248
1249         tap_length++;
1250 }
1251
1252 static void jlink_tap_append_scan(int length, uint8_t *buffer,
1253                 struct scan_command *command)
1254 {
1255         struct pending_scan_result *pending_scan_result =
1256                 &pending_scan_results_buffer[pending_scan_results_length];
1257         int i;
1258
1259         pending_scan_result->first = tap_length;
1260         pending_scan_result->length = length;
1261         pending_scan_result->command = command;
1262         pending_scan_result->buffer = buffer;
1263
1264         for (i = 0; i < length; i++) {
1265                 int tms = (i < (length - 1)) ? 0 : 1;
1266                 int tdi = (buffer[i / 8] & (1 << (i % 8))) != 0;
1267                 jlink_tap_append_step(tms, tdi);
1268         }
1269         pending_scan_results_length++;
1270 }
1271
1272 /* Pad and send a tap sequence to the device, and receive the answer.
1273  * For the purpose of padding we assume that we are in idle or pause state. */
1274 static int jlink_tap_execute(void)
1275 {
1276         int byte_length;
1277         int i;
1278         int result;
1279
1280         if (!tap_length)
1281                 return ERROR_OK;
1282
1283         /* JLink returns an extra NULL in packet when size of incoming
1284          * message is a multiple of 64, creates problems with USB comms.
1285          * WARNING: This will interfere with tap state counting. */
1286         while ((DIV_ROUND_UP(tap_length, 8) % 64) == 0)
1287                 jlink_tap_append_step((tap_get_state() == TAP_RESET) ? 1 : 0, 0);
1288
1289         /* number of full bytes (plus one if some would be left over) */
1290         byte_length = DIV_ROUND_UP(tap_length, 8);
1291
1292         bool use_jtag3 = jlink_hw_jtag_version >= 3;
1293         usb_out_buffer[0] = use_jtag3 ? EMU_CMD_HW_JTAG3 : EMU_CMD_HW_JTAG2;
1294         usb_out_buffer[1] = 0;
1295         usb_out_buffer[2] = (tap_length >> 0) & 0xff;
1296         usb_out_buffer[3] = (tap_length >> 8) & 0xff;
1297         memcpy(usb_out_buffer + 4, tms_buffer, byte_length);
1298         memcpy(usb_out_buffer + 4 + byte_length, tdi_buffer, byte_length);
1299
1300         jlink_last_state = jtag_debug_state_machine(tms_buffer, tdi_buffer,
1301                         tap_length, jlink_last_state);
1302
1303         result = jlink_usb_message(jlink_handle, 4 + 2 * byte_length, byte_length);
1304         if (result != byte_length) {
1305                 LOG_ERROR("jlink_tap_execute, wrong result %d (expected %d)",
1306                                 result, byte_length);
1307                 jlink_tap_init();
1308                 return ERROR_JTAG_QUEUE_FAILED;
1309         }
1310
1311         memcpy(tdo_buffer, usb_in_buffer, byte_length);
1312
1313         for (i = 0; i < pending_scan_results_length; i++) {
1314                 struct pending_scan_result *pending_scan_result = &pending_scan_results_buffer[i];
1315                 uint8_t *buffer = pending_scan_result->buffer;
1316                 int length = pending_scan_result->length;
1317                 int first = pending_scan_result->first;
1318                 struct scan_command *command = pending_scan_result->command;
1319
1320                 /* Copy to buffer */
1321                 buf_set_buf(tdo_buffer, first, buffer, 0, length);
1322
1323                 DEBUG_JTAG_IO("pending scan result, length = %d", length);
1324
1325                 jlink_debug_buffer(buffer, DIV_ROUND_UP(length, 8));
1326
1327                 if (jtag_read_buffer(buffer, command) != ERROR_OK) {
1328                         jlink_tap_init();
1329                         return ERROR_JTAG_QUEUE_FAILED;
1330                 }
1331
1332                 if (pending_scan_result->buffer != NULL)
1333                         free(pending_scan_result->buffer);
1334         }
1335
1336         jlink_tap_init();
1337         return ERROR_OK;
1338 }
1339
1340 /*****************************************************************************/
1341 /* JLink USB low-level functions */
1342
1343 static struct jlink *jlink_usb_open()
1344 {
1345         struct jtag_libusb_device_handle *devh;
1346         if (jtag_libusb_open(vids, pids, &devh) != ERROR_OK)
1347                 return NULL;
1348
1349         /* BE ***VERY CAREFUL*** ABOUT MAKING CHANGES IN THIS
1350          * AREA!!!!!!!!!!!  The behavior of libusb is not completely
1351          * consistent across Windows, Linux, and Mac OS X platforms.
1352          * The actions taken in the following compiler conditionals may
1353          * not agree with published documentation for libusb, but were
1354          * found to be necessary through trials and tribulations.  Even
1355          * little tweaks can break one or more platforms, so if you do
1356          * make changes test them carefully on all platforms before
1357          * committing them!
1358          */
1359
1360 #if IS_WIN32 == 0
1361
1362         jtag_libusb_reset_device(devh);
1363
1364 #if IS_DARWIN == 0
1365
1366         int timeout = 5;
1367         /* reopen jlink after usb_reset
1368          * on win32 this may take a second or two to re-enumerate */
1369         int retval;
1370         while ((retval = jtag_libusb_open(vids, pids, &devh)) != ERROR_OK) {
1371                 usleep(1000);
1372                 timeout--;
1373                 if (!timeout)
1374                         break;
1375         }
1376         if (ERROR_OK != retval)
1377                 return NULL;
1378 #endif
1379
1380 #endif
1381
1382         /* usb_set_configuration required under win32 */
1383         struct jtag_libusb_device *udev = jtag_libusb_get_device(devh);
1384         jtag_libusb_set_configuration(devh, 0);
1385         jtag_libusb_claim_interface(devh, 0);
1386
1387 #if 0
1388         /*
1389          * This makes problems under Mac OS X. And is not needed
1390          * under Windows. Hopefully this will not break a linux build
1391          */
1392         usb_set_altinterface(result->usb_handle, 0);
1393 #endif
1394
1395         jtag_libusb_get_endpoints(udev, &jlink_read_ep, &jlink_write_ep);
1396
1397         struct jlink *result = malloc(sizeof(struct jlink));
1398         result->usb_handle = devh;
1399         return result;
1400 }
1401
1402 static void jlink_usb_close(struct jlink *jlink)
1403 {
1404         jtag_libusb_close(jlink->usb_handle);
1405         free(jlink);
1406 }
1407
1408 /* Send a message and receive the reply. */
1409 static int jlink_usb_message(struct jlink *jlink, int out_length, int in_length)
1410 {
1411         int result;
1412
1413         result = jlink_usb_write(jlink, out_length);
1414         if (result != out_length) {
1415                 LOG_ERROR("usb_bulk_write failed (requested=%d, result=%d)",
1416                                 out_length, result);
1417                 return ERROR_JTAG_DEVICE_ERROR;
1418         }
1419
1420         result = jlink_usb_read(jlink, in_length);
1421         if ((result != in_length) && (result != (in_length + 1))) {
1422                 LOG_ERROR("usb_bulk_read failed (requested=%d, result=%d)",
1423                                 in_length, result);
1424                 return ERROR_JTAG_DEVICE_ERROR;
1425         }
1426
1427         if (jlink_hw_jtag_version < 3)
1428                 return result;
1429
1430         int result2 = ERROR_OK;
1431         if (result == in_length) {
1432                 /* Must read the result from the EMU too */
1433                 result2 = jlink_usb_read_emu_result(jlink);
1434                 if (1 != result2) {
1435                         LOG_ERROR("jlink_usb_read_emu_result retried requested = 1, "
1436                                         "result=%d, in_length=%i", result2, in_length);
1437                         /* Try again once, should only happen if (in_length%64 == 0) */
1438                         result2 = jlink_usb_read_emu_result(jlink);
1439                         if (1 != result2) {
1440                                 LOG_ERROR("jlink_usb_read_emu_result failed "
1441                                         "(requested = 1, result=%d)", result2);
1442                                 return ERROR_JTAG_DEVICE_ERROR;
1443                         }
1444                 }
1445
1446                 /* Check the result itself */
1447                 result2 = usb_emu_result_buffer[0];
1448         } else {
1449                 /* Save the result, then remove it from return value */
1450                 result2 = usb_in_buffer[result--];
1451         }
1452
1453         if (result2) {
1454                 LOG_ERROR("jlink_usb_message failed with result=%d)", result2);
1455                 return ERROR_JTAG_DEVICE_ERROR;
1456         }
1457
1458         return result;
1459 }
1460
1461 /* calls the given usb_bulk_* function, allowing for the data to
1462  * trickle in with some timeouts  */
1463 static int usb_bulk_with_retries(
1464                 int (*f)(jtag_libusb_device_handle *, int, char *, int, int),
1465                 jtag_libusb_device_handle *dev, int ep,
1466                 char *bytes, int size, int timeout)
1467 {
1468         int tries = 3, count = 0;
1469
1470         while (tries && (count < size)) {
1471                 int result = f(dev, ep, bytes + count, size - count, timeout);
1472                 if (result > 0)
1473                         count += result;
1474                 else if ((-ETIMEDOUT != result) || !--tries)
1475                         return result;
1476         }
1477         return count;
1478 }
1479
1480 static int wrap_usb_bulk_write(jtag_libusb_device_handle *dev, int ep,
1481                 char *buff, int size, int timeout)
1482 {
1483         /* usb_bulk_write() takes const char *buff */
1484         return jtag_libusb_bulk_write(dev, ep, buff, size, timeout);
1485 }
1486
1487 static inline int usb_bulk_write_ex(jtag_libusb_device_handle *dev, int ep,
1488                 char *bytes, int size, int timeout)
1489 {
1490         return usb_bulk_with_retries(&wrap_usb_bulk_write,
1491                         dev, ep, bytes, size, timeout);
1492 }
1493
1494 static inline int usb_bulk_read_ex(jtag_libusb_device_handle *dev, int ep,
1495                 char *bytes, int size, int timeout)
1496 {
1497         return usb_bulk_with_retries(&jtag_libusb_bulk_read,
1498                         dev, ep, bytes, size, timeout);
1499 }
1500
1501 /* Write data from out_buffer to USB. */
1502 static int jlink_usb_write(struct jlink *jlink, int out_length)
1503 {
1504         int result;
1505
1506         if (out_length > JLINK_OUT_BUFFER_SIZE) {
1507                 LOG_ERROR("jlink_write illegal out_length=%d (max=%d)",
1508                                 out_length, JLINK_OUT_BUFFER_SIZE);
1509                 return -1;
1510         }
1511
1512         result = usb_bulk_write_ex(jlink->usb_handle, jlink_write_ep,
1513                 (char *)usb_out_buffer, out_length, JLINK_USB_TIMEOUT);
1514
1515         DEBUG_JTAG_IO("jlink_usb_write, out_length = %d, result = %d",
1516                         out_length, result);
1517
1518         jlink_debug_buffer(usb_out_buffer, out_length);
1519         return result;
1520 }
1521
1522 /* Read data from USB into in_buffer. */
1523 static int jlink_usb_read(struct jlink *jlink, int expected_size)
1524 {
1525         int result = usb_bulk_read_ex(jlink->usb_handle, jlink_read_ep,
1526                 (char *)usb_in_buffer, expected_size, JLINK_USB_TIMEOUT);
1527
1528         DEBUG_JTAG_IO("jlink_usb_read, result = %d", result);
1529
1530         jlink_debug_buffer(usb_in_buffer, result);
1531         return result;
1532 }
1533
1534 /* Read the result from the previous EMU cmd into result_buffer. */
1535 static int jlink_usb_read_emu_result(struct jlink *jlink)
1536 {
1537         int result = usb_bulk_read_ex(jlink->usb_handle, jlink_read_ep,
1538                 (char *)usb_emu_result_buffer, 1 /* JLINK_EMU_RESULT_BUFFER_SIZE */,
1539                 JLINK_USB_TIMEOUT);
1540
1541         DEBUG_JTAG_IO("jlink_usb_read_result, result = %d", result);
1542
1543         jlink_debug_buffer(usb_emu_result_buffer, result);
1544         return result;
1545 }
1546
1547 #ifdef _DEBUG_USB_COMMS_
1548 #define BYTES_PER_LINE  16
1549
1550 static void jlink_debug_buffer(uint8_t *buffer, int length)
1551 {
1552         char line[81];
1553         char s[4];
1554         int i;
1555         int j;
1556
1557         for (i = 0; i < length; i += BYTES_PER_LINE) {
1558                 snprintf(line, 5, "%04x", i);
1559                 for (j = i; j < i + BYTES_PER_LINE && j < length; j++) {
1560                         snprintf(s, 4, " %02x", buffer[j]);
1561                         strcat(line, s);
1562                 }
1563                 LOG_DEBUG("%s", line);
1564         }
1565 }
1566 #endif